Wireless telegraphy.



B. V- DEITZ.

WIRELESS TELEGRAPHY.

APPLICATION FILED MAY 6. I914.

1,189,070. Patented June 27,1916.

2 SHEETS-SHEET I.

Wrzzeg B. V. DEiTZ.

WIRELESS TELEGRAPHY. APPLICATION FILED MAY 6, 1914.

1 1 89,070, Patented June 27, 1916.

2 SHEETS-SHEET 2.

QEQ4 .Ziz v ezz Z02 Barr Z! Zea 5' WWW UNITED STATES PATENT OFFICE.

3m V. IIJIIJLIFJZ, OF SLIITGEBLANDS, NEW YORK.

wnmmss TELnemnY.

"citizen of the United State residing Slingerlands, in the county ofAlbany and State of New York, have invented new and useful Improvementsin Wireless Telegraphy, of which the following is a specification.

My present invention relates to improvements in the art of wirelesstelegraphy or radio-transmission and has for its ob ect to provide asystem whereby two or more messages or signals can be transmitted fromone aerial system or apparatus wlth relatively high efficiency andwithout interference between the messages or signals A further object ofthe invention is to provide apparatus for accomplishing this resultwhich is relatively simple and inexpensive in its construction and whichis capable of operating with high efliciency.

To these and other ends, the invention consists in certain improvements,and combinations and arrangements of parts, all as will be hereinaftermore fully described, the novel features being pointed out particularlyin the claims at the end of the specification.

In the accompanying drawings:-Figure 1 is a diagram of a multiplexwireless telegraph or radio-transmission system embodying the presentinvention; Fig. 2 is a front elevation of a rotary discharger andalternator adapted to be used in connection with the present invention;Fig. 3 is a top lan view of the rotary discharger and a ter nator.

Similar parts are designated by the same reference characters in theseveral views I have found from experience that while the discharges ofa radio-transmitter occur as frequently as five-hundred times a second,each single discharge occupies So small a part of a second that thedischarges in the aggregate consume only a small fraction of the timeelapsing during transmission. According to the present invention, Iutilize a part of the time heretofore lmused and existing in theintervals between discharges to transmit one or more additional dis-Speciflcation of Letters Patent.

PatentedJune 27, 1916.

tinguishable messages or signals by applying one or more additionaltransmitters which, according to the present invention, are used withthe same aerial system, that is to say, a plurality of transmitters areemployed in connection with a single or common aerial system.

I have shown in the accompanying drawings and will hereinafter describea system embodying the present invention which comprises twotransmitters operating with a single aerial system. It will beunderstood, however, that the invention is not restricted to the precisearrangement shown, as equivalent arrangements are contemplated, andalsoit will be understood that the invention comprehends a multiplex sys temwhich may employ two or more transtnitters operating with the sameaerial sysm. In the system shown in Fig. 1, A represents an aerialsystem, B represents what I term a rotary alternator which serves tobring the different transmitters alternately or successively intooperative relation with the system, C and C represent condensers for therespective transmitters, D represents a dynamo or source of power tooperate the system, a multi-phase alternating current dynamo beingshown. I and X represent inductance for one transmitter-and a con denserfor the other transmitter respectively, O and 0' represent oscillationtransformers for the respective transmitters, R represents a rotarydischarger operative in synchronism with the alternator B andcoiiperative with the pairs of spark plugs LL and MM, T and T representthe primary or step-up transformers, K and K represent the keys of therespective transm1tters,' G represents'i the ground for the system, andUrepresents a motor which, in the present instance, is used to operatethe rotary discharger R and the rotary alter nator B. H and J designatestationary spark-plugs 'forthe rotary alternator.

The elements above described are connected with the necessary fuses andswitches in the following way :The aerial A is connected to one side ofthe rotary alternator of the left-hand transmitter, this inductancebeing'preferably adjustable in order that it -may vary the wavelengthsfrom this transmitter, and the stationary spark plug J of the rotaralternator is connected to a condenser for the right-hand transmitter tovary the wave lengths for the right-hand transmitter in order to enablethe receiving operators to easily distinguish between the multipletransmission of messages or signals from the diiferent transmitters. Theoscillation transformers O and O are connected by a wire 0 to ground Gand the oscillation transformers are also connected to the inductanceIand condenser X respectively, as shown. The oscillation transformersare also connected to the condensers C and C and to the secondaries ofthe transformers T and T, the stationary spark,

plugs L-L of the rotary discharger being connected to the oscillationtransformer O,

condenser C and transformer T, as shown, and the stationary plugs M--Mof the rotary discharger being connected to theoscillationtransformer O,condenser C and transformer T, as shown. The primaries of thetransformers T and T are connected to the multi-phase alternatingcurrent dynamo or source of kower by the wires T and T, and the keys andK are connecte ed to the multi-phase alternating current dynamo D by thewires T and T. While the ground leads from both transmitters areconnected permanently to the ground, the aerial, according to thepresent invention, is rapidly brought into operative relation with onetransmitter and rendered inoperative relatively to the othertransmitter, and vice versa, whereby when a message is being sent fromone transmitter, the circuit between the other transmitter and theaerial is broken. Therefore, the entire energy from each transmitter isalternately or successively sent from the aerial system without lossthrough a transmitter not at that moment in action. To this end, thespark plugs of the rotary alternator and the rotary dischargercorresponding to the different transmitters are so related that, whenthe plugs MM on the rotary discharger corresponding to the left-handtransmitter are in discharging position, the spark. plug H of the rotaryalternator corresponding to this same transmitteris also in dischargingposition, while at this same .moment the spark plu L-L of the rotarydischarger correspon ing to the right-hand transmitter and the sparkplug J of the rotary alternator corresponding to this same transmitteroccupy positions between the projections on the dischaxger andalternator tively and are therefore .in non-discharge positions. Thereverse action tnkes place on further rotation ncvl md alternatorwhereby the righttransmitter is brou the aerialeand the left-hand sydemis rendered inactive relative] to the aerial.

In the construction charger R and the rotary alternator B oomprise diskswhich are mounted on but inght into action relatively to sulated from asingle shaft V of a motorbll,

the motor being preferabl interposed alternator and tween the dischargerand the ,whole being mounted upon a suitable insulating base W. Therotary discharge: R embodies preferably a metallic disk which is rigidlyfined on a rubber'or insulating bushmg P which occupies a laneperpendicular tpl th; akxiis1 of the shaft 2, the outer face of t e isaving plugs rojectmg therefrom c uidistantly and a in circumferential aement, these plugs 0 I relatively long radially but of narrowcircumferential length. The stationary l or electrodes L-L and M--M arepre the insulating base W at the outer side of the disk of the rotarydischu-ger and are positioned in immediate proximity to' the path of theplugs S on the whereby the plugs S pass and are alternately in discrelation with the per of monnry l LL and MM vel The fa es f thestationary plugs L L and I l-H. present surfaces which are relatively 1rsdially and are narrow cimumferentizfi to tlie corsrespolilding' orsimilar surfaces 0; the p u on t e I rovidfii ark may fTorihr-y and revoving plugs which will insure accurately timed and sharp discharges ofthe sparks between the pl 1 Iihe h otary miar to t e r it ahm etallic 81grad rm ii temotor a an vingpugs mjecting from the outer face thereof,these plugs being relatively long radially but narrow circumferentially,and the stationary plugs H and J are mounted on the insulating base Wand present similar-faces to the plugs B on the alternator disk.

The adjustment of the stationary plugs is such that, during rotation ofthe discharge!- disk, the plugs MM are opposite to a pair of plugs SS onthe discharger disk, and the plug H will be opposite to a plug on therotary alternator disk, while in two transmitters, as shown, the plugsL- are midway between the plugs on the rotary discharger disk and the plJ of the. rotary alternator will also be mi way between the plugs on therotary alternator disk. Synchronism is thus obtained between the rotarydischarger and the rotary alternator, and

own,therotarydislymountedon when a discharge takes place between one setof plugs, the other set of plugs is in nondischarge position.

The motor U, preferably an electric motor, is so arranged, by reason ofthe position of its armature relatively to the position of the rotarydischarger and alternator disks, that, while the motor is running at itsspeed on one phase of the alternating current, the motor brings theplugs leading from the transmitting condenser, which is driven by thesame phase current, to sparking position and discharges that condenserimmediately after such condenser has become charged to capacity and thecurrent has ceased to flow from the transformer which charged thatcondenser, each condenser being-discharged in a like manner. While thespark takes place in one transmitter only at a time, the speed of themotor and the rotary discharger and alternator is such that thedischarges in any transmitter are sufliciently rapid and frequent toproduce a musical note which is the audible result of the operation ofone transmitter, and this musical note may be interrupted at will byaction of the key of the respective transmitter to form signals ormessages.

While, as stated, but two transmitters are shown, a third transmittermay be added by introducing two additional electrodes or spark plugs tothe rotary discharger and one additional stationary spark plug to thealternator, rendering the discharger and alternator synchronous andtiming the system so that no two transmitters act at one time, the timespace or interval between the actions of the different transmittersbeing preferably equal, this being accomplished by suitably spacing theadditional stationary spark plugs or electrodes for the rotarydischarger and alternator. In a similar way, additional transmitters maybe added to the system and, in any case, a multiplex system is producedwhich enables a plurality of signals or messages to be transmitted fromthe same aerial with efficiency and without interference between thesignals or messages.

I claim as my invention:

1. A system of radio-telegraph) comprising a plurality of independenttransmitters embodying oscillation transformers for producing trains ofwaves of different lengths respectively, a single aerial common to saidtransmitters, a rotary discharger common to said transmitters, a rotaryalter nator, and means for continuously operating such alternatorsynchronously with said discharger, the alternator alternately renderingthe transmitters operative relatively to said aerial and rendering theother transmitter or transmitters inoperative with respect thereto.

2. A system of radio-telegraphy comprising a plurality of independenttransmitters embodying oscillation transformers operative to produce.natural sympathetic vibrations of different wavelengths respectively, asingle aerial common to said transmitters, a rotary discharger common tosaid transmitters, a rotary alternator, and means for continuouslyoperating such alternator synchronously with said discharger toalternately render the transmitters operative relatively to said aerialand to render the other transmitter or transmitters inoperative withrespect thereto.

3. A system of radio-telegraphy comprising a plurality of independenttransmitters embodying oscillation transformers va= riable independentlyto produce natural sympathetic vibrations of different perodicities, asingle aerial common to said trans-- mitters, a rotary discharger commonto said transmitters, a rotary alternator, and means for continuouslyoperating said alternator synchronously with the discharger toalternately render the transmitters operative relatively to the aerialand to render the other transmitter or transmitters inoperative withrespect thereto.

4. A system of radio-telegraphy comprising a plurality of independenttransmitters embodying oscillation transformers for producing trains ofwaves of different lengths respectively, a single aerial common to saidtransmitters. a rotary discharger common to said transmitters, a rotaryalternator interposed between the oscillation transformers and theaerial, and means for continuously operating said alternatorsynchronously with the discharger to alternately render izhetransmitters operative relatively to the aerial and to render the othertransmitter or transmitters inoperative with respect thereto.

5. A system of radio-telegraphy comprising a plurality of independenttransmitters embodying oscillation transformers operative to producenatural sympathetic vibrations of. different wave lengths respectively,a single aerial common to said transmitters, a rotary discharger commonto said transmitters. a single rotary alternator interposed between theoscillation transformers and the aerial, and means for continuouslyoperating such alternator synchronously with the discharger toalternately render the transmitters operative relatively to the aerialand to render the other transmitter or transmitters inoperative withrespect thereto.

6. A system of radio-telegraphy comprising a plurality of independenttransmitters embodying oscillation transformers variable independentlyto produce natural sympathetic vibrations of different wave lengthsrespectively, a single aerial common to and mitters, a rotaryalternator, and means 'for In testimony whereof I have hereunto setcontinuously operating the alternator synmy hand in presence of twosubscribing witchronously with, the disoharger to alternesses.

nately render the transmitters operative rel- BURR V. DEI'I Z. ativelyto the aerial and to render the other Witnesses:

transmitter or transmitters inoperative with C. A. BATEMAN, respectthereto. CHAS. S. Hm.

